are.lmom.valid {lmomco} | R Documentation

## Are the L-moments valid

### Description

The second through fifth order L-moments are perhaps the most common in analysis situations. These L-moments have particular constraints on magnitudes and relation to each other. This function evaluates and L-moment object whether: L-scale (λ_2 > 0), (|tau_3| < 1), L-kurtosis (0.25(5tau_3^2 - 1) <= tau_4 < 1), and |tau_5| < 1.

### Usage

    are.lmom.valid(lmom)

### Arguments

`lmom` | A L-moment object created by `lmom.ub` or `pwm2lmom`.

### Value

`TRUE` | L-moments are valid.
`FALSE` | L-moments are not valid.

### Author(s)

W.H. Asquith

### References

Hosking, J.R.M., 1990, L-moments—Analysis and estimation of distributions using linear combinations of order statistics: Journal of the Royal Statistical Society, Series B, vol. 52, p. 105-124.

Hosking, J.R.M. and Wallis, J.R., 1997, Regional frequency analysis—An approach based on L-moments: Cambridge University Press.

### See Also

`lmom.ub`, `lmoms`, and `pwm2lmom`

### Examples

    lmr <- lmom.ub(rnorm(20))
    if(are.lmom.valid(lmr)) print("They are.")

[Package lmomco version 0.92 Index]